QUALITATIVE ANALYSIS

Which of the following solutions can be used to distinguish between sodium hydroxide and aqueous ammonia?

Aluminium sulfate solution

Iron(II) chloride solution

Iron(III) chloride solution

Zinc sulfate solution

Correct!

Wrong!

In a qualitative analysis, reagent S is gradually added to a salt solution T(that contains either 1 or 2 different anions), followed by the addition of adilute acid. The graph below shows how the mass of precipitate formed changes with the reagents added.

A

B

C

D

Correct!

Wrong!

Which of the following reagents could be used to distinguish between dilute nitricacid and dilute hydrochloric acid?

Aqueous barium chloride

Copper(II) carbonate

Aqueous silver nitrate

Aqueous sodium hydroxide

Correct!

Wrong!

The reaction scheme below shows some simple tests carried out on compound, P. Compound P is likely to be

Aluminium chloride

Lead(II) chloride

Calcium carbonate

Zinc carbonate

Correct!

Wrong!

Chromium oxide dissolves in sodium hydroxide solution to form a green solution. Which deduction can be made from this observation?

Chromium is a metallic element.

Chromium oxide is insoluble in water.

Chromium oxide contains both hydrogen and hydroxide ions when dissolved in water.

Chromium oxide is amphoteric.

Correct!

Wrong!

Which of the following pairs of substances can be distinguished by dilute sulfuric acid?

I and III

II and III

I, II and III

All of the above

Correct!

Wrong!

10.0 cm3 of 1.0 mol/dm3 of aqueous iron(III) sulfate was mixed with 10.0 cm3 of 1.0 mol/dm3 of aqueous sodium hydroxide. What was observed when the reaction was complete?

A green precipitate and a colourless solution.

A green precipitate and a yellow solution.

A reddish brown precipitate and a yellow solution.

A reddish brown precipitate and a colourless solution.

Correct!

Wrong!

The table shows the observations made when the aqueous solution Y was tested. What ions does solution Y contain?

Cu2+ and Cl-

Cu2+ and I-

Fe2+and Cl-

Fe2+ and I-

Correct!

Wrong!

When aqueous sodium hydroxide is added toa solution containing potassium sulfate and iron(III) nitrate, which of the following ions will decreasemost in concentration?

K+

SO42-

Fe3+

NO3-

Correct!

Wrong!

Which of the following chemical reagents could be used to confirm thepresence of SO42- ions?